@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

/* --- Base Variables & Styles --- */
:root {
    --font-family: 'Poppins', sans-serif;

    /* Light Theme */
    --bg-color-light: #f0f2f5; /* Slightly softer light bg */
    --text-color-light: #333; /* Darker text for better contrast */
    --panel-bg-light: #ffffff; /* Solid white panels */
    --panel-shadow-light: 0 4px 15px rgba(0, 0, 0, 0.08); /* Softer shadow */
    --panel-border-light: 1px solid #e8e8e8; /* Subtle border */
    --button-bg-light: #ffffff; /* Simple white buttons */
    --button-shadow-light: 0 2px 5px rgba(0, 0, 0, 0.1); /* Simple shadow */
    --button-text-light: #444;
    --button-active-bg-light: #e8eaf0; /* Subtle active state */
    --button-active-shadow-light: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    --accent-color-light: #007bff; /* Standard vibrant blue */
    --accent-gradient-light: linear-gradient(135deg, #007bff 0%, #0056b3 100%); /* Blue gradient */
    --input-bg-light: #f8f9fa; /* Light input background */
    --input-border-light: #ced4da;
    --sidebar-bg-light: #f8f9fa; /* Sidebar slightly off-white */
    --sidebar-bg-gradient-light: #f0f2f5; /* Gradient endpoint for sidebar */
    --sidebar-text-light: #343a40;
    --sidebar-active-bg-light: #ffffff; /* White active background */
    --equals-btn-bg-light: var(--accent-color-light);
    --equals-btn-text-light: #ffffff;
    --op-btn-text-light: var(--accent-color-light);
    --button-op-bg-light: #f8f9fa; /* Operator button background */
    --button-num-bg-light: #ffffff; /* Number button background */
    --display-bg-light: #f8f9fa; /* Calculator display background */
    --main-bg-light: #f5f7fa; /* Main area background */
    --accent-color-transparent-light: rgba(0, 123, 255, 0.1); /* Transparent accent */
    --button-hover-bg-light: #f0f2f5; /* Button hover background */
    --shadow-elevation-low-light: 0 2px 6px rgba(0, 0, 0, 0.08);
    --shadow-elevation-medium-light: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-elevation-high-light: 0 8px 24px rgba(0, 0, 0, 0.18);

    /* Dark Theme */
    --bg-color-dark: #1a1d24; /* Darker, less blue BG */
    --text-color-dark: #e0e0e0;
    --panel-bg-dark: #252934; /* Dark panel background */
    --panel-shadow-dark: 0 5px 20px rgba(0, 0, 0, 0.3); /* Darker shadow */
    --panel-border-dark: 1px solid #3a3f50; /* Darker border */
    --button-bg-dark: #2c313f; /* Dark button background */
    --button-shadow-dark: 0 3px 8px rgba(0, 0, 0, 0.3);
    --button-text-dark: #e0e0e0;
    --button-active-bg-dark: #3a3f50; /* Darker active state */
    --button-active-shadow-dark: inset 0 1px 3px rgba(0, 0, 0, 0.4);
    --accent-color-dark: #28a745; /* Vibrant Green */
    --accent-gradient-dark: linear-gradient(135deg, #28a745 0%, #218838 100%); /* Green gradient */
    --input-bg-dark: #2c313f; /* Matching dark input */
    --input-border-dark: #495057;
    --sidebar-bg-dark: #21252e; /* Dark sidebar */
    --sidebar-bg-gradient-dark: #1a1d24; /* Gradient endpoint for sidebar */
    --sidebar-text-dark: #adb5bd;
    --sidebar-active-bg-dark: #2c313f; /* Active bg matches button */
    --equals-btn-bg-dark: var(--accent-color-dark);
    --equals-btn-text-dark: #ffffff;
    --op-btn-text-dark: var(--accent-color-dark);
    --button-op-bg-dark: #2c313f; /* Operator button background */
    --button-num-bg-dark: #33394a; /* Number button background */
    --display-bg-dark: #1e222c; /* Calculator display background */
    --main-bg-dark: #1a1d24; /* Main area background */
    --accent-color-transparent-dark: rgba(40, 167, 69, 0.1); /* Transparent accent */
    --button-hover-bg-dark: #33394a; /* Button hover background */
    --shadow-elevation-low-dark: 0 2px 6px rgba(0, 0, 0, 0.25);
    --shadow-elevation-medium-dark: 0 4px 12px rgba(0, 0, 0, 0.35);
    --shadow-elevation-high-dark: 0 8px 24px rgba(0, 0, 0, 0.45);
    
    /* Shared Styles */
    --text-color-secondary: rgba(128, 128, 128, 0.8);
    --border-radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: var(--font-family);
    transition: background-color 0.4s ease, color 0.4s ease;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 0;
    margin: 0;
    overflow-x: hidden;
    overflow-y: auto; /* Explicitly allow vertical scrolling */
}

body[data-theme="light"] {
    --bg-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --text-color-secondary: rgba(100, 100, 100, 0.8);
    --panel-bg: var(--panel-bg-light);
    --panel-shadow: var(--panel-shadow-light);
    --panel-border: var(--panel-border-light);
    --button-bg: var(--button-bg-light);
    --button-shadow: var(--button-shadow-light);
    --button-text: var(--button-text-light);
    --button-active-bg: var(--button-active-bg-light);
    --button-active-shadow: var(--button-active-shadow-light);
    --accent-color: var(--accent-color-light);
    --accent-gradient: var(--accent-gradient-light);
    --input-bg: var(--input-bg-light);
    --input-border: var(--input-border-light);
    --sidebar-bg: var(--sidebar-bg-light);
    --sidebar-bg-gradient: var(--sidebar-bg-gradient-light);
    --sidebar-text: var(--sidebar-text-light);
    --sidebar-active-bg: var(--sidebar-active-bg-light);
    --equals-btn-bg: var(--equals-btn-bg-light);
    --equals-btn-text: var(--equals-btn-text-light);
    --op-btn-text: var(--op-btn-text-light);
    --button-op-bg: var(--button-op-bg-light);
    --button-num-bg: var(--button-num-bg-light);
    --display-bg: var(--display-bg-light);
    --main-bg: var(--main-bg-light);
    --accent-color-transparent: var(--accent-color-transparent-light);
    --button-hover-bg: var(--button-hover-bg-light);
    --shadow-elevation-low: var(--shadow-elevation-low-light);
    --shadow-elevation-medium: var(--shadow-elevation-medium-light);
    --shadow-elevation-high: var(--shadow-elevation-high-light);
}

body[data-theme="dark"] {
    --bg-color: var(--bg-color-dark);
    --text-color: var(--text-color-dark);
    --text-color-secondary: rgba(170, 170, 170, 0.8);
    --panel-bg: var(--panel-bg-dark);
    --panel-shadow: var(--panel-shadow-dark);
    --panel-border: var(--panel-border-dark);
    --button-bg: var(--button-bg-dark);
    --button-shadow: var(--button-shadow-dark);
    --button-text: var(--button-text-dark);
    --button-active-bg: var(--button-active-bg-dark);
    --button-active-shadow: var(--button-active-shadow-dark);
    --accent-color: var(--accent-color-dark);
    --accent-gradient: var(--accent-gradient-dark);
    --input-bg: var(--input-bg-dark);
    --input-border: var(--input-border-dark);
    --sidebar-bg: var(--sidebar-bg-dark);
    --sidebar-bg-gradient: var(--sidebar-bg-gradient-dark);
    --sidebar-text: var(--sidebar-text-dark);
    --sidebar-active-bg: var(--sidebar-active-bg-dark);
    --equals-btn-bg: var(--equals-btn-bg-dark);
    --equals-btn-text: var(--equals-btn-text-dark);
    --op-btn-text: var(--op-btn-text-dark);
    --button-op-bg: var(--button-op-bg-dark);
    --button-num-bg: var(--button-num-bg-dark);
    --display-bg: var(--display-bg-dark);
    --main-bg: var(--main-bg-dark);
    --accent-color-transparent: var(--accent-color-transparent-dark);
    --button-hover-bg: var(--button-hover-bg-dark);
    --shadow-elevation-low: var(--shadow-elevation-low-dark);
    --shadow-elevation-medium: var(--shadow-elevation-medium-dark);
    --shadow-elevation-high: var(--shadow-elevation-high-dark);
}

/* Additional tweaks for dark mode background */
body[data-theme="dark"] {
    background-color: #1a1e24;
}

/* Make sure the footer works well with the new design */
.site-footer {
    margin-top: 30px;
    padding-top: 50px; 
    padding-bottom: 30px;
    background: linear-gradient(to bottom, var(--panel-bg) 0%, var(--sidebar-bg-gradient) 100%);
    border-top: none;
    position: relative;
    width: 100%;
    overflow: hidden;
}

/* Decorative footer top divider */
.site-footer:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, 
        var(--accent-color) 0%, 
        var(--accent-color) 33%, 
        var(--button-active-bg) 33%, 
        var(--button-active-bg) 66%, 
        var(--sidebar-active-bg) 66%, 
        var(--sidebar-active-bg) 100%);
}

.footer-section h3 {
    position: relative;
    font-size: 1.3rem;
    margin-bottom: 20px;
}

/* Mobile menu toggle improved appearance */
#mobile-menu-toggle {
    background: var(--panel-bg);
    color: var(--accent-color);
}

/* --- Main App Container --- */
.calculator-app-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    background: var(--panel-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--panel-shadow);
    border: var(--panel-border);
    overflow: hidden;
    transition: background 0.3s ease, box-shadow 0.3s ease, border 0.3s ease;
    position: relative; /* Ensure positioning context */
    flex: 0 0 auto; /* Don't let it stretch */
}

@media (min-width: 768px) {
    .calculator-app-container {
        flex-direction: row;
        min-height: 700px; /* Use min-height instead of fixed height */
        max-height: none; /* Remove max-height restriction */
        margin: 20px auto;
    }
}

/* --- Sidebar --- */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    /* Remove backdrop-filter */
    /* backdrop-filter: blur(10px); */
     /* -webkit-backdrop-filter: blur(10px); */
    padding: 25px 15px;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    border-right: var(--panel-border);
    transition: background 0.3s ease, border 0.3s ease;
    overflow-y: auto; /* Allow sidebar scrolling if needed */
}

.sidebar header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
    padding-left: 10px;
}

.sidebar .logo-icon {
    font-size: 1.8rem;
    margin-right: 15px;
    color: var(--accent-color);
    transition: color 0.3s ease;
}

.sidebar h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    transition: color 0.4s ease;
}

.sidebar nav {
    flex-grow: 1;
    margin-top: 10px; /* Add some space below header */
}

.sidebar nav ul {
    list-style: none;
}

.sidebar nav li {
    margin-bottom: 8px;
}

.nav-button {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 12px 15px;
    background: transparent;
    border: none;
    border-radius: 8px; /* Slightly smaller radius */
    font-family: var(--font-family);
    font-size: 0.95rem;
    color: var(--sidebar-text);
    cursor: pointer;
    text-align: left;
    transition: background-color 0.2s ease, color 0.2s ease; /* Faster transition */
}

.nav-button .icon {
    margin-right: 12px;
    width: 20px; /* Ensure icons align */
    text-align: center;
    color: var(--accent-color);
     transition: color 0.3s ease;
}

.nav-button:hover {
    background-color: rgba(128, 128, 128, 0.1);
    color: var(--text-color);
}

.nav-button.active {
    background-color: var(--sidebar-active-bg);
    color: var(--text-color); /* Use main text color */
    font-weight: 600; /* Make active bolder */
    box-shadow: none; /* Remove inset shadow for cleaner look */
}

.nav-button.active .icon {
     color: var(--accent-color); /* Use accent color for active icon */
}


.sidebar footer {
    margin-top: auto; /* Pushes footer to the bottom */
    padding-top: 15px;
    border-top: 1px solid rgba(128, 128, 128, 0.1);
    display: flex;
    justify-content: center;
}

#theme-toggle {
    background: var(--button-bg);
    border: none;
    border-radius: 20px;
    padding: 8px 15px;
    cursor: pointer;
    box-shadow: var(--button-shadow);
    transition: all 0.2s ease; /* Faster transition */
    color: var(--button-text);
    font-size: 1rem;
    display: flex;
    align-items: center;
}

#theme-toggle:hover {
    transform: translateY(-1px); /* Subtle hover lift */
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

#theme-toggle:active {
    box-shadow: var(--button-active-shadow);
    transform: scale(0.98);
}

#theme-toggle .toggle-separator {
    margin: 0 5px;
    opacity: 0.5;
}

/* Icon highlighting based on theme */
body[data-theme="light"] #theme-toggle .fa-sun { color: var(--accent-color-light); }
body[data-theme="dark"] #theme-toggle .fa-moon { color: var(--accent-color-dark); }
body[data-theme="light"] #theme-toggle .fa-moon { opacity: 0.5; }
body[data-theme="dark"] #theme-toggle .fa-sun { opacity: 0.5; }


/* --- Main Calculator Area --- */
.calculator-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    padding: 20px;
    overflow-y: auto; /* Allow scrolling within panels if needed */
}

.calculator-panel {
    display: none; /* Hide inactive panels */
    animation: fadeIn 0.4s ease-in-out; /* Keep fade-in */
}

.calculator-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.calculator-panel h2 {
    font-size: 1.6rem; /* Slightly larger title */
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 25px; /* More space below title */
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--panel-border); /* Add separator line */
    padding-bottom: 10px;
}

.calculator-panel h2 .icon {
    margin-right: 12px;
    color: var(--accent-color);
    transition: color 0.3s ease;
}

/* Form Styles (for most calculators) */
.form-group {
    margin-bottom: 20px; /* More spacing */
}

.form-group label {
    display: block;
    margin-bottom: 8px; /* More space after label */
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.9rem;
}

.form-group input[type="number"],
.form-group input[type="date"],
.form-group input[type="text"] /* Include text input for basic calc */
{
    width: 100%;
    padding: 12px 15px; /* Larger padding */
    border-radius: 6px; /* Standard border radius */
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    appearance: textfield; /* Hide number spinners */
    -moz-appearance: textfield; /* Firefox */
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(var(--accent-color-rgb), 0.2); /* Focus ring */
}
/* Add RGB versions of accent colors for focus ring */
body[data-theme="light"] { --accent-color-rgb: 0, 123, 255; }
body[data-theme="dark"] { --accent-color-rgb: 40, 167, 69; }


.calc-action-btn {
    padding: 12px 25px; /* More padding */
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    background: var(--accent-gradient); /* Use gradient for action buttons */
    color: white;
    transition: background 0.3s ease, transform 0.1s ease, box-shadow 0.2s ease;
    display: block; /* Make block to center easily if needed */
    width: fit-content; /* Fit content width */
    margin-top: 15px; /* Space above button */
    box-shadow: 0 3px 8px rgba(0,0,0,0.1);
}

.calc-action-btn:hover {
    background-size: 150% 150%; /* Subtle gradient shift on hover */
    transform: translateY(-2px);
    box-shadow: 0 5px 12px rgba(0,0,0,0.15);
}

.calc-action-btn:active {
    transform: scale(0.98);
    background-size: 100% 100%;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.result-display, .result-status {
    margin-top: 20px; /* More space above results */
    font-size: 1.1rem;
    font-weight: 500;
    padding: 15px;
    border-radius: 6px;
    background-color: var(--input-bg); /* Use input background for results */
    border: 1px solid var(--input-border);
    min-height: 50px; /* Ensure minimum height */
    word-wrap: break-word;
}

.result-status {
    margin-top: 10px; /* Less space between main result and status */
    font-size: 1rem;
    font-weight: 400;
    border-color: transparent; /* Remove border for status */
    background-color: transparent; /* Make status background transparent */
    padding: 5px 0; /* Adjust padding */
}

/* Specific Panel Styles */

/* Currency Converter */
#panel-currency .exchange-icon {
    text-align: center;
    font-size: 1.5rem;
    color: var(--accent-color);
    margin: 10px 0; /* Add some margin */
}
#panel-currency .conversion-rate {
    margin-top: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
}
#panel-currency .conversion-rate label {
    margin-bottom: 0;
    flex-shrink: 0;
}
#panel-currency .conversion-rate input {
    max-width: 100px;
}

/* Percentage Calculator */
#panel-percentage .form-group {
    display: flex;
    align-items: center;
    gap: 10px;
}
#panel-percentage .form-group label {
    margin-bottom: 0;
    width: auto;
}
#panel-percentage input[type="number"] {
    width: 150px; /* Adjust width */
}


/* Basic/Scientific Calculator */
.calc-display-container {
    position: relative;
    margin-bottom: 15px;
}
#calc-display {
    width: 100%;
    height: 70px; /* Taller display */
    padding: 10px 20px;
    padding-right: 60px; /* Space for CE button */
    font-size: 2.2rem; /* Larger font */
    text-align: right;
    background-color: var(--input-bg);
    color: var(--text-color);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
    margin-bottom: 0; /* Remove default input margin */
    overflow-x: auto; /* Allow horizontal scroll if number is too long */
    white-space: nowrap;
}

#calc-clear-entry {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    padding: 8px 10px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-color);
    background-color: transparent; /* Transparent background */
    border: 1px solid var(--input-border);
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

#calc-clear-entry:hover {
    background-color: rgba(128, 128, 128, 0.1);
    border-color: var(--text-color);
}


.calc-buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr); /* Keep 5 columns */
    gap: 10px; /* Consistent gap */
}

.calc-btn {
    padding: 18px 0; /* Adjust padding for new look */
    font-size: 1.1rem;
    font-weight: 500;
    border: none; /* Remove border */
    border-radius: 8px;
    cursor: pointer;
    background: var(--button-bg);
    color: var(--button-text);
    box-shadow: var(--button-shadow);
    transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.1s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calc-btn:hover {
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15); /* Enhanced hover shadow */
    transform: translateY(-1px);
}

.calc-btn:active {
    background: var(--button-active-bg);
    box-shadow: var(--button-active-shadow);
    transform: scale(0.97); /* Slightly stronger active scale */
}

.calc-btn-op {
    color: var(--op-btn-text); /* Use accent color for operators */
    font-weight: 500;
}

.calc-btn-util { /* C and CE */
   /* background: #f8d7da; /* Light red hint */
   /* color: #721c24; */
   font-weight: 500;
}

/* Keep dark theme util buttons distinct if needed */
/* body[data-theme="dark"] .calc-btn-util { */
   /* background: #5c3034; */
   /* color: #f5c6cb; */
/* } */


.calc-btn-equals {
    grid-column: span 1; /* Keep span 1 */
    background: var(--equals-btn-bg); /* Use specific variable */
    color: var(--equals-btn-text); /* Use specific variable */
    font-size: 1.5rem; /* Larger equals sign */
    font-weight: bold;
}

.calc-btn-equals:hover {
    filter: brightness(1.1); /* Brighter hover */
    box-shadow: 0 4px 12px rgba(var(--accent-color-rgb), 0.3);
}

.calc-btn-equals:active {
    filter: brightness(0.95);
    transform: scale(0.97);
    box-shadow: var(--button-active-shadow);
}

.calc-btn-zero {
    grid-column: span 2; /* Make 0 wider */
}

.calc-btn-wide {
     grid-column: span 2;
}

/* --- Responsiveness --- */
@media (max-width: 1024px) {
    .calculator-app-container {
        max-height: none; /* Allow flexible height */
        height: auto; /* Let content determine height */
        flex-direction: column; /* Stack sidebar and main on tablet */
    }
    .sidebar {
        width: 100%; /* Full width */
        height: auto; /* Auto height */
        border-right: none;
        border-bottom: var(--panel-border); /* Add border below */
        flex-direction: row; /* Horizontal layout */
        align-items: center;
        padding: 10px 15px; /* Adjust padding */
        overflow-x: auto; /* Allow horizontal scroll for nav */
        overflow-y: hidden;
    }
     .sidebar header { margin-bottom: 0; margin-right: 20px; padding-left: 5px;}
     .sidebar h1 { font-size: 1.3rem; }
     .nav-button { font-size: 0.9rem; padding: 8px 12px; white-space: nowrap;} /* Prevent wrapping */
     .sidebar nav { flex-grow: 0; flex-shrink: 1; min-width: 0;} /* Allow nav to shrink */
     .sidebar nav ul { display: flex; gap: 8px; }
     .sidebar footer { margin-top: 0; margin-left: auto; padding-top: 0; border: none;}
     .calculator-main { padding: 25px; }
     .calculator-panel h2 { font-size: 1.4rem; }
     .calc-btn { padding: 15px 0; font-size: 1.1rem; }
     #calc-display { height: 60px; font-size: 1.9rem; }
}

@media (max-width: 768px) {
    body {
        padding: 0; /* Remove body padding */
        align-items: flex-start; /* Align top */
    }
    .calculator-app-container {
        width: 100%;
        height: 100vh; /* Full viewport height */
        border-radius: 0; /* No border radius */
        border: none;
        box-shadow: none;
    }
    .sidebar {
        padding: 8px 10px; /* Reduced padding */
    }
     .sidebar header { margin-bottom: 0; margin-right: 15px; padding-left: 5px;}
     .sidebar h1 { display: none; } /* Hide text title on mobile */
     .sidebar .logo-icon { font-size: 1.6rem; margin-right: 0; }
     /* Keep horizontal nav */
     .sidebar nav ul { gap: 5px; }
     .nav-button {
        font-size: 0.85rem; /* Adjust font size */
        padding: 6px 10px;
        flex-direction: column; /* Stack icon and text */
        align-items: center;
        min-width: 65px; /* Ensure some minimum width */
        text-align: center;
        line-height: 1.2;
     }
     .nav-button .icon { margin-right: 0; margin-bottom: 3px; font-size: 1rem; width: auto; }
     .sidebar footer { margin-left: auto; /* Push theme toggle right */}
     #theme-toggle { font-size: 0.9rem; padding: 6px 10px; }

    .calculator-main {
        padding: 20px; /* Reduced padding */
        height: calc(100vh - 60px); /* Adjust height based on sidebar */
    }
    .calculator-panel h2 { font-size: 1.3rem; margin-bottom: 20px;}
     /* Basic Calc Specific adjustments */
     .calc-buttons { grid-template-columns: repeat(5, 1fr); gap: 8px; }
     .calc-btn { padding: 12px 0; font-size: 1rem; }
     #calc-display { height: 55px; font-size: 1.7rem; padding-right: 50px; }
     #calc-clear-entry { font-size: 0.7rem; padding: 6px 8px; }

     /* Other forms adjustments */
     #panel-percentage .form-group { flex-direction: column; align-items: flex-start; gap: 5px;}
     #panel-percentage input[type="number"] { width: 100%; }
     .form-group { margin-bottom: 15px; }
     .result-display, .result-status { font-size: 1rem; }
}

@media (max-width: 480px) {
    .sidebar { padding: 6px 8px;}
    .sidebar header { margin-right: 10px;}
    .sidebar .logo-icon { font-size: 1.5rem;}
    .nav-button { font-size: 0.7rem; min-width: 55px; padding: 5px 4px; } /* Further shrink nav buttons */
    .nav-button .icon { font-size: 0.9rem; }
    .calculator-main { padding: 15px; height: calc(100vh - 52px); /* Adjust height */}

    .calc-buttons { gap: 6px; }
    .calc-btn { padding: 10px 0; font-size: 0.9rem; border-radius: 6px;}
    #calc-display { height: 50px; font-size: 1.5rem;}
    #calc-clear-entry { right: 6px; padding: 5px 7px; font-size: 0.65rem;}

    .calculator-panel h2 { font-size: 1.2rem; margin-bottom: 15px;}
    .form-group label { font-size: 0.85rem; margin-bottom: 5px;}
    .form-group input { padding: 10px 12px; font-size: 0.9rem;}
    .calc-action-btn { padding: 10px 20px; font-size: 0.9rem;}
    .result-display, .result-status { font-size: 0.95rem; padding: 12px;}
}

/* Utility to prevent text selection */
.no-select {
  -webkit-user-select: none; /* Safari */
  -moz-user-select: none; /* Firefox */
  -ms-user-select: none; /* IE10+/Edge */
  user-select: none; /* Standard */
}

/* --- Specific Panel Adjustments --- */

/* Shared select styling */
select {
    padding: 10px 15px;
    border-radius: 6px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 0.95rem;
    font-family: var(--font-family);
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    height: 46px; /* Match input height */
    flex-grow: 1; /* Allow select to grow in flex containers */
}

select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(var(--accent-color-rgb), 0.2);
}


/* Currency Converter */
#panel-currency .exchange-icon {
    text-align: center;
    font-size: 1.5rem;
    color: var(--accent-color);
    margin: 10px 0; /* Add some margin */
}

/* Percentage Calculator */
#panel-percentage .form-group {
    display: flex;
    align-items: center;
    gap: 10px;
}
#panel-percentage .form-group label {
    margin-bottom: 0;
    width: auto;
}
#panel-percentage input[type="number"] {
    width: 150px; /* Adjust width */
}

/* Data Storage Converter */
#panel-data .form-group select {
    width: 100%; /* Make select full width */
}
#panel-data .result-display {
     white-space: pre-wrap; /* Allow line breaks */
     font-family: monospace; /* Use monospace for better alignment */
     font-size: 1rem;
     line-height: 1.6;
}

/* Date Calculator */
.datecalc-operation {
    display: flex;
    align-items: center;
    gap: 10px;
}

.datecalc-operation select,
.datecalc-operation input {
    flex-grow: 1;
}

.datecalc-operation input {
     max-width: 120px; /* Limit width of number input */
}

@media (max-width: 768px) {
    /* Adjust date calc layout on smaller screens */
    .datecalc-operation {
        flex-wrap: wrap; /* Allow wrapping */
    }
    .datecalc-operation input {
        min-width: 80px; /* Ensure number input doesn't get too small */
        max-width: none; /* Remove max width */
    }
}

/* Add specific styles if needed */
#panel-compound-interest .form-group select {
     width: 100%; /* Ensure frequency dropdown takes full width */
}

/* Category list styling */
.calculator-categories {
    list-style: none;
}

.category-item {
    margin-bottom: 15px; /* Space between categories */
}

.category-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--sidebar-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
    padding: 5px 10px;
    background-color: rgba(128, 128, 128, 0.05);
    border-radius: 5px;
    display: flex;
    align-items: center;
}

.category-title .icon {
    margin-right: 8px;
    font-size: 0.9rem;
    color: var(--accent-color);
    width: 18px; /* Align category icons */
    text-align: center;
}

/* Nested list for calculators within category */
.category-calculators {
    list-style: none;
    padding-left: 15px; /* Indent calculators under category */
    border-left: 2px solid rgba(var(--accent-color-rgb), 0.2); /* Subtle indicator line */
    margin-left: 10px; /* Align with title */
}

.category-calculators li {
    margin-bottom: 5px; /* Reduce space between calc buttons */
}

/* Style for disabled nav buttons */
.nav-button.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: transparent !important; /* Ensure no hover effect */
    color: var(--sidebar-text) !important;
}

.nav-button.disabled .icon {
     color: var(--sidebar-text); /* Dim icon color */
     opacity: 0.5;
}

/* Radio button group styling */
.radio-group {
    display: flex;
    gap: 15px;
    align-items: center;
}
.radio-group input[type="radio"] {
    /* Hide default radio button */
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--input-border);
    border-radius: 50%;
    margin-right: 5px;
    cursor: pointer;
    position: relative;
    top: 3px; /* Align vertically */
    transition: border-color 0.2s ease;
}
.radio-group input[type="radio"]:checked {
    border-color: var(--accent-color);
}
.radio-group input[type="radio"]:checked::before {
    content: '';
    display: block;
    width: 10px;
    height: 10px;
    background-color: var(--accent-color);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: background-color 0.2s ease;
}
.radio-group label {
    margin-bottom: 0; /* Override default label margin */
    cursor: pointer;
    font-weight: 400;
    font-size: 0.95rem;
}

/* Textarea styling */
textarea {
    width: 100%;
    padding: 10px 15px;
    border-radius: 6px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    font-family: var(--font-family);
    resize: vertical; /* Allow vertical resize */
    min-height: 80px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(var(--accent-color-rgb), 0.2);
}

/* Length Converter */
.length-converter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}
.length-converter-group input,
.length-converter-group select {
    flex: 1; /* Distribute space */
}
.length-converter-group input[type="text"] {
    background-color: var(--input-bg); /* Match other inputs */
    border: 1px solid var(--input-border);
    padding: 12px 15px;
    border-radius: 6px;
}
.length-converter-group span {
    font-weight: bold;
    color: var(--accent-color);
    font-size: 1.2rem;
}

#panel-length .result-display {
    font-size: 0.95rem; /* Slightly smaller for all results */
    line-height: 1.7;
}

/* Temperature Converter */
.temp-converter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}
.temp-converter-group input,
.temp-converter-group select {
    flex: 1;
}
.temp-converter-group input[type="text"] {
    background-color: var(--input-bg); /* Match other inputs */
    border: 1px solid var(--input-border);
    padding: 12px 15px;
    border-radius: 6px;
}
.temp-converter-group span {
    font-weight: bold;
    color: var(--accent-color);
    font-size: 1.5rem;
}

/* Statistics Panel */
#stats-result {
    white-space: pre-wrap; /* Preserve formatting */
    font-family: monospace;
    font-size: 1rem;
    line-height: 1.6;
}

/* Ohm's Law Panel */
.ohm-instruction {
    font-size: 0.85rem;
    color: var(--sidebar-text); /* Use sidebar text color for subtle instruction */
    margin-top: -10px; /* Reduce space above */
    margin-bottom: 15px;
    text-align: center;
}
#ohm-result {
    white-space: pre-wrap;
    font-family: monospace;
    font-size: 1rem;
    line-height: 1.6;
}

/* Construction Panel */
#const-inputs .form-group {
    margin-bottom: 10px; /* Less space between dynamic inputs */
}
#const-inputs label {
    font-size: 0.85rem;
    margin-bottom: 4px;
}
#const-result {
    white-space: pre-wrap;
}

/* Love Calculator Panel */
#love-result {
    font-size: 1.3rem;
    text-align: center;
    font-weight: bold;
}

/* --- Hamburger Menu (Mobile Only) --- */
#mobile-menu-toggle {
    display: none; /* Hidden by default */
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 1001; /* Above sidebar */
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1.5em;
    padding: 10px 14px;
    border-radius: var(--border-radius);
    cursor: pointer;
    box-shadow: var(--shadow-elevation-low);
    transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease; /* Improved transitions */
}

#mobile-menu-toggle:hover {
    background-color: var(--button-hover-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

#mobile-menu-toggle:active {
    transform: scale(0.95);
    box-shadow: var(--button-active-shadow);
}

/* Add state for when menu is open */
#mobile-menu-toggle.menu-open .fa-bars:before {
    content: "\f00d"; /* Change to X icon when open */
}

/* New: Prevent scrolling when sidebar is open */
body.sidebar-open-no-scroll {
    overflow: hidden;
}

/* New: Sidebar Overlay */
#sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* Semi-transparent black */
    z-index: 999; /* Below sidebar, above main content */
    opacity: 0;
    transition: opacity 0.3s ease-in-out; /* Fade in/out */
    backdrop-filter: blur(2px); /* Add slight blur effect */
    -webkit-backdrop-filter: blur(2px);
}

#sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* Updated Mobile Menu Styles */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px; /* Slightly wider sidebar */
        width: 280px; /* Increase width for better usability */
        top: 0;
        height: 100%;
        max-height: 100vh;
        z-index: 1000;
        transition: left 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
        overflow-y: auto; /* Enable vertical scrolling */
        -webkit-overflow-scrolling: touch; /* Better scroll on iOS */
        background-color: var(--sidebar-bg);
        padding: 15px; /* Slightly more padding */
        box-shadow: none; /* No shadow when hidden */
        display: flex;
        flex-direction: column; /* Switch back to column layout on mobile */
    }

    .sidebar.sidebar-open {
        left: 0;
        box-shadow: var(--shadow-elevation-high);
    }

    /* Mobile Menu Styles */
    .sidebar header {
        display: flex;
        align-items: center;
        margin-bottom: 20px;
        padding-left: 10px;
        flex-shrink: 0; /* Prevent header from shrinking */
    }

    .sidebar h1 {
        display: block; /* Show title on mobile */
        font-size: 1.2rem;
    }

    .sidebar .logo-icon {
        font-size: 1.4rem;
        margin-right: 10px;
    }

    /* Mobile Navigation Links - Improve for scrolling */
    .sidebar nav {
        flex-grow: 1;
        margin-top: 5px;
        overflow-y: auto;
        padding-bottom: 20px; /* Add space at bottom for better scrolling */
        /* Remove any fixed height that might limit scrolling */
        height: auto;
        max-height: calc(100vh - 150px); /* Leave space for header/footer */
    }

    .sidebar nav ul {
        display: block; /* Stack vertically instead of horizontal */
        gap: 0;
        padding: 0;
    }

    .category-title {
        font-size: 0.9rem;
        margin-top: 15px; /* Space above categories */
    }

    .category-calculators {
        padding-left: 10px;
        margin-left: 5px;
        margin-bottom: 15px; /* Add space between categories */
    }

    .nav-button {
        display: flex;
        flex-direction: row; /* Horizontal layout */
        align-items: center;
        padding: 12px 15px;
        text-align: left;
        font-size: 0.9rem;
        margin: 1px 0;
        min-width: auto; /* Remove minimum width */
    }
    
    .nav-button .icon {
        margin-right: 10px;
        margin-bottom: 0;
        width: 20px;
        text-align: center;
    }

    /* Adjust main content */
    .calculator-main {
        margin-left: 0;
        padding: 20px;
        padding-top: 75px; /* Space for fixed hamburger menu */
    }

    /* Keep hamburger button visible */
    #mobile-menu-toggle {
        display: block;
    }

    /* Footer adjustments */
    .sidebar footer {
        margin-top: 15px;
        padding-top: 15px;
        border-top: 1px solid rgba(128, 128, 128, 0.1);
        display: flex;
        flex-direction: column;
        align-items: center;
        margin-left: 0;
        flex-shrink: 0; /* Prevent footer from shrinking */
    }

    #theme-toggle {
        margin-bottom: 10px;
    }
    
    .credits {
        margin-top: 10px;
        text-align: center;
    }
    
    /* Restored styles for calculator panels and form groups */
    .calculator-app-container {
        flex-direction: column; /* Stack sidebar and main on very small screens */
    }

    .calculator-panel {
        padding: 20px;
    }

    .calculator-panel h2 {
        font-size: 1.3em;
        margin-bottom: 20px;
    }

    /* Adjust form groups for better stacking */
    .form-group {
        flex-direction: column;
        align-items: flex-start;
    }
    .form-group label {
        min-width: auto; /* Remove min-width */
        margin-right: 0;
        margin-bottom: 8px;
    }
    .form-group input[type="text"],
    .form-group input[type="number"],
    .form-group input[type="date"],
    .form-group select,
    .form-group textarea,
    .radio-group { /* Make radio group full width */
        width: 100%;
        min-width: 0; /* Remove min-width */
    }

    /* Specific adjustments for stacked layouts */
    .form-group.datecalc-operation {
        flex-direction: row; /* Keep date +/- controls inline */
        flex-wrap: wrap; /* Allow wrap */
        gap: 8px;
    }
    .form-group.datecalc-operation select,
    .form-group.datecalc-operation input {
        flex-grow: 1; /* Allow elements to grow */
        width: auto;
        margin: 0;
    }
    .form-group.datecalc-operation input {
        min-width: 60px; /* Smaller width for number */
    }

    .length-converter-group,
    .temp-converter-group {
        flex-direction: column;
        align-items: stretch; /* Make items full width */
    }
    .length-converter-group span,
    .temp-converter-group span {
        text-align: center; /* Center the =/⇌ sign */
        margin: 5px 0;
        transform: rotate(90deg); /* Rotate icon */
    }

    /* Sci Calc Buttons */
    .calc-buttons {
        gap: 8px; /* Slightly smaller gap */
    }
    .calc-btn {
        padding: 15px 8px; /* Adjust padding */
        font-size: 1.1em;
    }

    /* Slightly larger font for main display */
    #calc-display {
        font-size: 2em;
        padding-right: 55px; /* Ensure CE is still visible */
    }
    #calc-clear-entry {
        right: 6px;
        height: calc(100% - 12px);
        font-size: 0.8em;
        padding: 4px 8px;
    }
}

/* Further adjustments for smaller screens */
@media (max-width: 480px) {
    .sidebar {
        width: 260px; /* Slightly smaller width for very small screens */
        left: -260px;
    }

    #mobile-menu-toggle {
        top: 10px;
        left: 10px;
    }

    .calculator-main {
        padding: 15px;
        padding-top: 60px; /* Less space above content */
    }
    
    /* Restored small screen adjustments */
    .calculator-panel h2 {
        font-size: 1.2em;
    }
    .calc-btn {
        font-size: 1em; /* Smaller sci buttons */
    }
    #calc-display {
        font-size: 1.8em;
    }
    .result-display,
    .result-status {
        font-size: 1em; /* Smaller result font */
    }
}

.toggle-separator {
    opacity: 0.5;
}

.credits {
    font-size: 0.8em;
    color: var(--text-color-secondary);
    margin-top: 8px;
}

/* Site Footer Enhanced Styles */
.site-footer {
    margin-top: 30px;
    padding-top: 50px; 
    padding-bottom: 30px;
    background: linear-gradient(to bottom, var(--panel-bg) 0%, var(--sidebar-bg-gradient) 100%);
    border-top: none;
    position: relative;
    width: 100%;
    overflow: hidden;
}

/* Decorative footer top divider */
.site-footer:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, 
        var(--accent-color) 0%, 
        var(--accent-color) 33%, 
        var(--button-active-bg) 33%, 
        var(--button-active-bg) 66%, 
        var(--sidebar-active-bg) 66%, 
        var(--sidebar-active-bg) 100%);
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    gap: 30px;
    padding: 0 20px;
}

.footer-section {
    flex: 1;
    min-width: 250px;
}

.footer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--accent-color);
    position: relative;
    font-weight: 600;
}

.footer-section h3:after {
    content: "";
    display: block;
    width: 40px;
    height: 3px;
    background-color: var(--accent-color);
    margin-top: 8px;
    border-radius: 2px;
}

.footer-section p {
    line-height: 1.6;
    margin-bottom: 10px;
}

.footer-section.links ul {
    list-style: none;
    padding: 0;
}

.footer-section.links ul li {
    margin-bottom: 10px;
}

.footer-section.links ul li a {
    position: relative;
    padding-left: 15px;
    transition: all 0.3s ease;
}

.footer-section.links ul li a:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    opacity: 0.7;
    transition: transform 0.3s ease;
}

.footer-section.links ul li a:hover:before {
    transform: translateX(3px);
    opacity: 1;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.social-links a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--button-bg);
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-elevation-low);
}

.social-links a:hover {
    background-color: var(--accent-color);
    color: white;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 25px;
    margin-top: 30px;
    border-top: 1px solid rgba(128, 128, 128, 0.1);
    font-size: 0.9em;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

/* Footer Responsive Adjustments */
@media (max-width: 768px) {
    .site-footer {
        padding-top: 40px;
        margin-top: 20px;
    }
    
    .footer-section h3 {
        font-size: 1.1rem;
    }
}

/* Desktop View Enhancements */
@media (min-width: 1025px) {
    body {
        padding: 20px;
        background: #1a1e24;
        background-image: linear-gradient(135deg, rgba(30, 35, 45, 0.8) 0%, rgba(20, 25, 35, 0.8) 100%);
        min-height: 100vh;
        height: auto; /* Allow body to grow with content */
    }
    
    /* Ensure the container doesn't force viewport height */
    .calculator-app-container {
        max-width: 1300px;
        margin: 20px auto;
        box-shadow: 0 15px 40px rgba(0, 0, 0, 0.25);
        border-radius: 16px;
        overflow: hidden;
        border: 1px solid rgba(70, 70, 70, 0.2);
        height: auto; /* Allow natural height */
        min-height: 700px;
    }
    
    .sidebar {
        width: 300px;
        background: linear-gradient(to bottom, var(--sidebar-bg) 0%, var(--sidebar-bg-gradient) 100%);
        position: relative;
        transition: all 0.3s ease;
        padding: 25px 15px;
    }
    
    .sidebar:after {
        content: '';
        position: absolute;
        top: 0;
        right: 0;
        height: 100%;
        width: 1px;
        background: linear-gradient(to bottom, rgba(128, 128, 128, 0.1), rgba(128, 128, 128, 0.2), rgba(128, 128, 128, 0.1));
    }
    
    .sidebar header {
        padding: 20px 15px;
        border-bottom: 1px solid rgba(128, 128, 128, 0.1);
        margin-bottom: 25px;
        display: flex;
        align-items: center;
    }
    
    .sidebar h1 {
        font-size: 1.8rem;
        letter-spacing: 0.5px;
        margin-left: 12px;
        font-weight: 500;
        background: linear-gradient(135deg, var(--accent-color) 0%, var(--text-color) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    
    .sidebar .logo-icon {
        font-size: 2rem;
        color: var(--accent-color);
        filter: drop-shadow(0 2px 3px rgba(0, 0, 0, 0.2));
    }

    /* Navigation Category Headers */
    .category-title {
        padding: 14px 15px;
        font-size: 0.9rem;
        letter-spacing: 1px;
        text-transform: uppercase;
        font-weight: 600;
        color: var(--accent-color);
        margin-top: 20px;
        margin-bottom: 8px;
        position: relative;
        padding-left: 20px;
        transition: all 0.3s ease;
    }
    
    /* Navigation Buttons */
    .nav-button {
        padding: 12px 20px;
        border-radius: 10px;
        margin: 4px 10px;
        transition: all 0.25s ease;
        position: relative;
        overflow: hidden;
        z-index: 1;
        font-weight: 400;
        letter-spacing: 0.3px;
    }
    
    .nav-button:hover {
        background-color: var(--button-hover-bg);
        transform: translateX(5px);
        color: var(--accent-color);
    }
    
    .nav-button.active {
        background-color: var(--accent-color-transparent);
        color: var(--accent-color);
        font-weight: 500;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }
    
    .nav-button.active:before {
        content: '';
        position: absolute;
        left: 0;
        top: 0;
        height: 100%;
        width: 4px;
        background: var(--accent-color);
        border-radius: 0 2px 2px 0;
    }
    
    .nav-button .icon {
        color: var(--accent-color);
        margin-right: 12px;
        width: 22px;
        text-align: center;
        transition: all 0.3s ease;
    }
    
    .nav-button:hover .icon {
        transform: scale(1.1);
    }
    
    /* Main Calculator Area */
    .calculator-main {
        padding: 40px;
        background-color: var(--main-bg);
        flex: 1;
        position: relative;
    }
    
    .calculator-panel {
        padding: 30px;
        background: var(--panel-bg);
        border-radius: var(--border-radius);
        box-shadow: var(--shadow-elevation-medium);
        max-width: 900px;
        margin: 0 auto;
        transition: all 0.3s ease;
        position: relative;
    }
    
    .calculator-panel h2 {
        font-size: 1.8rem;
        margin-bottom: 25px;
        color: var(--text-color);
        border-bottom: 1px solid rgba(128, 128, 128, 0.1);
        padding-bottom: 15px;
        display: flex;
        align-items: center;
    }
    
    .calculator-panel h2 .icon {
        color: var(--accent-color);
        margin-right: 12px;
        font-size: 1.5rem;
    }

    /* Calculator Display */
    .calc-display-container {
        margin-bottom: 25px;
        background-color: var(--display-bg);
        padding: 15px;
        border-radius: var(--border-radius);
        box-shadow: var(--shadow-elevation-low);
        position: relative;
        border: 1px solid rgba(128, 128, 128, 0.1);
        transition: all 0.3s ease;
    }
    
    .calc-display-container:focus-within {
        box-shadow: 0 0 0 2px rgba(var(--accent-color-rgb), 0.3);
    }
    
    #calc-display {
        font-size: 2.5rem;
        font-weight: 300;
        letter-spacing: 1px;
        height: 70px;
        text-align: right;
        transition: all 0.3s ease;
    }
    
    /* Calculator Buttons */
    .calc-buttons {
        gap: 12px;
    }
    
    .calc-btn {
        font-size: 1.2rem;
        border-radius: 12px;
        box-shadow: var(--shadow-elevation-low);
        transition: all 0.2s ease;
        position: relative;
        overflow: hidden;
        border: 1px solid rgba(128, 128, 128, 0.1);
    }
    
    .calc-btn:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-elevation-medium);
    }
    
    .calc-btn:active {
        transform: translateY(1px);
        box-shadow: var(--shadow-elevation-low);
    }
    
    .calc-btn-op {
        background-color: var(--button-op-bg);
        color: var(--accent-color);
        font-weight: 500;
    }
    
    .calc-btn-num {
        background-color: var(--button-num-bg);
    }
    
    .calc-btn-equals {
        background: linear-gradient(135deg, var(--accent-color) 0%, rgba(var(--accent-color-rgb), 0.8) 100%);
        color: white;
        font-weight: 500;
    }
    
    /* Form Elements */
    .form-group input[type="text"],
    .form-group input[type="number"],
    .form-group input[type="date"],
    .form-group select,
    .form-group textarea {
        border-radius: 10px;
        border: 1px solid rgba(128, 128, 128, 0.2);
        transition: all 0.3s ease;
        box-shadow: var(--shadow-elevation-low);
    }
    
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
        box-shadow: 0 0 0 2px rgba(var(--accent-color-rgb), 0.3);
    }
    
    .calc-action-btn {
        position: relative;
        overflow: hidden;
        background: linear-gradient(135deg, var(--accent-color) 0%, rgba(var(--accent-color-rgb), 0.8) 100%);
        border-radius: 10px;
        font-weight: 500;
        letter-spacing: 0.3px;
    }
    
    .calc-action-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 10px rgba(var(--accent-color-rgb), 0.3);
    }
}

/* Additional media query to handle page layout on very large screens */
@media (min-width: 1025px) and (min-height: 900px) {
    body {
        display: block; /* Change from flex to block for natural document flow */
    }
    
    .calculator-app-container, 
    .site-footer {
        width: 100%;
        max-width: 1300px;
        margin-left: auto;
        margin-right: auto;
    }
}

/* Restore responsive tweaks */
@media (min-width: 1400px) {
    .calculator-panel {
        max-width: 1000px;
    }
    
    .calculator-main {
        padding: 40px;
    }
}

/* Calculator Info Section for SEO Content */
.calculator-info {
    margin-top: 30px;
    padding: 20px;
    background: rgba(var(--accent-color-rgb), 0.05);
    border-radius: 12px;
    border-left: 3px solid var(--accent-color);
}

.calculator-info h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.calculator-info p {
    margin-bottom: 12px;
    line-height: 1.6;
    color: var(--text-color-secondary);
}

.calculator-info ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.calculator-info li {
    margin-bottom: 8px;
    line-height: 1.5;
    color: var(--text-color-secondary);
}

/* Calculator Info Responsive Adjustments */
@media (max-width: 768px) {
    .calculator-info {
        padding: 15px;
        margin-top: 25px;
    }
    
    .calculator-info h3 {
        font-size: 1.1rem;
    }
}